HK 100 EXAM 1 UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
COMPLETE STUDY GUIDE
●● sacromere
Answer: Basic contracting unit of muscle cell consists of actin and
myosin filaments between z-lines in a muscle cell
●● delayed onset muscle soreness
Answer: Pain or discomfort often felt 24 to 72 hours after intense
exercise or unaccustomed physical activity (DOMS)
●● concentric
Answer: when muscle fibers are shortening (Ceiling)(flexion)
●● eccentric
Answer: when muscle fibers lengthen (Earth)(extension)
●● isometric
Answer: when muscle fibers tense (tension) but no actual movement (In
between)
,●● sliding filament hypothesis
Answer: thin filaments slide over thick filaments, shortening the
sarcomere
●● cross-bridge hypothesis
Answer: muscle contraction states how force is produced, and how the
filaments actin and myosin are moved relative to each other to produce
muscle shortening
●● Electromyography (EMG)
Answer: the electrical recording of muscle activity
●● myosin
Answer: thick filament (in A-band)
●● actin
Answer: thin filaments
●● first step of muscle contraction
Answer: in the neuromuscular junction, a chemical is released from the
end of the nerve fiber, which causes a rapid change in voltage in the
muscle
, ●● second step of muscle contraction
Answer: the electrical signal travels over the surface of, and along, the
muscle fibers
●● third step of muscle contraction
Answer: the electrical signal causes the release of calcium ions into the
cytoplasm (intracellular fluid( of the muscle fiber. this i san important
part of the process because it is the line between excitation and
contraction)
●● fourth step of muscle contraction
Answer: the calcium ions expose active sites on the actin (thin)
myofilaments, to which the myosin filaments immediately attach
●● final step of muscle contraction
Answer: because of these attachments (cross-bridges), each myosin
filament pulls the actin filaments that overlap with it at either end toward
its center, producing cross-bridge cycling, which is the mechanical
response to the electrical signal
●●
Answer: number of muscle fibers per motor unit?
●● transduction
QUESTIONS AND CORRECT ANSWERS
COMPLETE STUDY GUIDE
●● sacromere
Answer: Basic contracting unit of muscle cell consists of actin and
myosin filaments between z-lines in a muscle cell
●● delayed onset muscle soreness
Answer: Pain or discomfort often felt 24 to 72 hours after intense
exercise or unaccustomed physical activity (DOMS)
●● concentric
Answer: when muscle fibers are shortening (Ceiling)(flexion)
●● eccentric
Answer: when muscle fibers lengthen (Earth)(extension)
●● isometric
Answer: when muscle fibers tense (tension) but no actual movement (In
between)
,●● sliding filament hypothesis
Answer: thin filaments slide over thick filaments, shortening the
sarcomere
●● cross-bridge hypothesis
Answer: muscle contraction states how force is produced, and how the
filaments actin and myosin are moved relative to each other to produce
muscle shortening
●● Electromyography (EMG)
Answer: the electrical recording of muscle activity
●● myosin
Answer: thick filament (in A-band)
●● actin
Answer: thin filaments
●● first step of muscle contraction
Answer: in the neuromuscular junction, a chemical is released from the
end of the nerve fiber, which causes a rapid change in voltage in the
muscle
, ●● second step of muscle contraction
Answer: the electrical signal travels over the surface of, and along, the
muscle fibers
●● third step of muscle contraction
Answer: the electrical signal causes the release of calcium ions into the
cytoplasm (intracellular fluid( of the muscle fiber. this i san important
part of the process because it is the line between excitation and
contraction)
●● fourth step of muscle contraction
Answer: the calcium ions expose active sites on the actin (thin)
myofilaments, to which the myosin filaments immediately attach
●● final step of muscle contraction
Answer: because of these attachments (cross-bridges), each myosin
filament pulls the actin filaments that overlap with it at either end toward
its center, producing cross-bridge cycling, which is the mechanical
response to the electrical signal
●●
Answer: number of muscle fibers per motor unit?
●● transduction
